Well , Mike , nowadays there's much talk about nanometer . But what on earth is it ?   Nanometer is a length scale . It's one billionth of a meter , roughly ten times the size of an individual atom .   Hmm ... it's hard to figure out the exact size , I'm afraid .   Well , let's make it this way . For comparison , 10 NM is 1000 times smaller than the diameter of a human hair . There are as many nanometers in an inch as there are inches in 400 miles .   I see.Thank you . 